Refrigerating cars.



REFRIGERATING CARS.

APPLIOATION FILED AUG. 3. 1906.

FIG.]

PATENTED NOV. 12, 1907.

FIG. 3

FIG. 4

BY IU, QW-

A TTORNE Y UNITED STATES FICE.

PAIEN I CHARLES C. TROWBRIDGE, OF NEW YORK, N. Y.

REFRIGERATIN G CARS.

Specification of Letters Patent.

Patented Nov. ,12, 1907.

Application filed August 3.1906- Serial No. 328,981-

To all whom it may concern.

Be it known that 1, CHARLES C. TROWBRIDGE, of the city, county, and State of New York, have invented a new andlmproved Art of Refrigerating Cars, of

which the following is a full, clear,'and exact description. l

My invention relates to the art of refrigerating railwaycars, and the object of my invention is to produce a means of keeping cars cold, so as to preserve perishable commodities therein, and to do this without the necessity either of icing cars, thereby consuming large of potassium 'bromid, consisting of approximately 32-15/100 bromid and 67-85/100 water have a definite freezing and melting point, that in the case given being about 8 F. Different cryohydrates can be used to obtain different melting points for different purposes. In utilizing the cryohydrates in an efficient I way for preserving the correct temperature in the car,

I arrange in the car preferably in the top a relatively large-coil which is filled with the cryohydrate, and through this coil I run a second pipe which extends through the entire coil, and the ends of which protrude from the end of the car. The outer coil is filled as stated with the cryohydrate, and the inner coil has cold brine pumped through it, or an ammonia or other quickly expanding gas can be allowed to expand through the coil, thusfreczing the surrounding s0lution. The surrounding solution has a relatively large cross section and when frozen it makes therefore a large body of frozen matter which is sufficient to maintain the car at a very low temperature. In carrying out the idea, cooling depots can be maintained at the important stations along the line. so that if the ten],- perature rises above a desirable point, the solution in the outer coil can he again frozen at one of these stations and the desired temperature maintained. For instance, a car starting from (hicago to New York will be provided with the foreign solution and if when reaching Buffalo, the solution is melted, it can again be frozen in a short time by coupling the inner pipe or coil to a freezing arrangement of the kind specified.

In carrying out the invention, I prefer to use a cryohydrate because I can get a low temperature and can have a definite freezing point, but I do not limit the invent-ion to this precise arrangement.

I am aware that it is not new to provide a freight car with freezing coils and to freeze the solution therein; also that ice in cakes and brine tanks in the car have been made cold by freezing coils passing through them,

even from outside the stationary apparatus; but I am 1 not aware that the arrangement has ever been such as I have shown, whereby from an exterior and stationary freezing plant the solution, and particularly a cryohydrate solution, can be frozen in a car along an adjacent track. l

It will readily be seen that the arrangement which I have described keeps the car perfectly clean and cold, and that the temperature can be maintained at comparatively little expense.

With these ends in view, my invention consists of l I certain improvements in the art of refrigerating cars,

which will be hereinafter particularly described, and the novel features claimed.

Reference is to be had to the accompanying drawings forming a part of this specification, in which similar letters and figures of reference indicate corresponding parts in all the views.

Figure V1 is a broken sectional elevation of a freight car provided with my improved apparatus, part of which is shown in section. Fig. 2 is a sectional plan of the apparatus in the car. Fig. 3 is an enlarged detail cross section of a portion of the coils, and Fig. 4 is a cross section of a modification of the apparatus.

The freight car 10 can be of any approved construction, but I prefer to use a car of which the top is made so as to be practically a non-conductor of heat, and in the car, preferably near the top, I arrange a coil of pipe 11 of large cross section which can be supported in any convenient way,'such as by means of hangers 12 and 1-2. The coil can be made of any desirable size and it has its ends fastened preferably in the ends of the car. At one end of the coil is a valve 13, and at-the other a valve M which control the inlet and outlet of the inner coil 15, which is a pipe of relatively small diameter extending longitudinally through the upper coil 11.

For convenience in filling and draining the outer coil is provided with an inlet pipe 16 at the top which is controlled by a valve 17, and through which the solution is supplied to the coil 11, and the said coil has also an outlet pipe 18 which can be used fordrainage desired, the outer pipe or coil ll large cross section, as in Fig. 4, pipes 15 extended through it.

When the car is to be refrigerated the solution is supplied to the outer coil 11 and a freezing arrangement coupled to the pipe 15, and as stated, this may be of any device which will supply a freezing compound or gas to the pipe 15, and as l. have already stated, by having these freezing arrangements at necessary intervals alongthc line, the desired temperature can be very easily maintained throughout the whole line.

The advantage of using cryohydratc solution outside of that mentioned is that l have found that when it and several freezing freezes it does not have the cxpansiblo and bursting purposes, and which is controlled by a valve 19. If can be made of very qualities of ordinary ice, and for this reason, it is a good solution to use in a pipe, which with ordinary matter, might be burst with the freezing when completed.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent,

In combination with a chamber, a cooling device therefor comprising a coil closed at both ends, a smaller coil passing between the first named coil terminating exterior of the chamber at both ends, controlling valves arranged 10 on the exterior portions of the smaller coil, 8. charge of I cryohydrate in the space between the first named coil and the smaller coil, an inlet pipe leading from the exterior of the casing and communicating with the first named coil, a valve for controlling said inlet pipe, an outlet pipe communicating with the first named coil and terminating exterior of the chamber and a valve for controlling the outlet pipe.

CHARLES C. TROWBRIDGE.

Witnesses V ROGER S. WHITE, 2d, Roenr. S. WHITE. 

